666561066151 has 32 divisors (see below), whose sum is σ = 689127912000. Its totient is φ = 644479607808.

The previous prime is 666561066097. The next prime is 666561066191. The reversal of 666561066151 is 151660165666.

It is a cyclic number.

It is not a de Polignac number, because 666561066151 - 2¹³ = 666561057959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666561066095 and 666561066104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666561066191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 645266731 + ... + 645267763.

It is an arithmetic number, because the mean of its divisors is an integer number (21535247250).

Almost surely, 2^666561066151 is an apocalyptic number.

666561066151 is a deficient number, since it is larger than the sum of its proper divisors (22566845849).

666561066151 is a wasteful number, since it uses less digits than its factorization.

666561066151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 666561066151 in words is "six hundred sixty-six billion, five hundred sixty-one million, sixty-six thousand, one hundred fifty-one".